Technology supposed to help not be a hindrance

Is it illegal to share music? Of course that is being debated and discussed now after the RIAA went after those who are file sharing music...which are mostly kids. I don't have KaZaa but..I download music too..I don't share it though. So..if they do thesame and then share it and then sell it(is that how it works?)then that be infringing copyrights. But they just share it...so nothing wrong with that...what's wrong is when downloads a music then alters it then sells it. I wonder if Filipinos who uses KaZaa too liable to be in trouble?